OUAQUK. Yep, I remember it well!! I think it was inbound from Geneva, I thought it was a great display, although you are quite correct about less than amused passengers.!!!!. I had a pleasure flight in a Cherokee [!],that day and was allowed to handle it to give the guy a rest!!!. I subsequently did my PPL there. I also remember Don Bullock displaying B.17 'Sally B' as it now is. My wife and I were sitting by the tower [I was flying in those days] when, having finished his display and spotted a group of us on the grass by the tower. Buzzed us very, very low, and scared my wife badly.
Sadly it was no surprise to hear that he ended up in a smoking hole at Biggin.